Logo Search packages:      
Sourcecode: zfs-fuse version File versions  Download package

zdb.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <stdio.h>
#include <stdio_ext.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/zfs_context.h>
#include <sys/spa.h>
#include <sys/spa_impl.h>
#include <sys/dmu.h>
#include <sys/zap.h>
#include <sys/fs/zfs.h>
#include <sys/zfs_znode.h>
#include <sys/vdev.h>
#include <sys/vdev_impl.h>
#include <sys/metaslab_impl.h>
#include <sys/dmu_objset.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_pool.h>
#include <sys/dbuf.h>
#include <sys/zil.h>
#include <sys/zil_impl.h>
#include <sys/stat.h>
#include <sys/resource.h>
#include <sys/dmu_traverse.h>
#include <sys/zio_checksum.h>
#include <sys/zio_compress.h>
#include <sys/zfs_fuid.h>
#include <sys/arc.h>
#undef ZFS_MAXNAMELEN
#undef verify
#include <libzfs.h>

const char cmdname[] = "zdb";
uint8_t dump_opt[256];

typedef void object_viewer_t(objset_t *, uint64_t, void *data, size_t size);

extern void dump_intent_log(zilog_t *);
uint64_t *zopt_object = NULL;
int zopt_objects = 0;
libzfs_handle_t *g_zfs;
boolean_t zdb_sig_user_data = B_TRUE;
int zdb_sig_cksumalg = ZIO_CHECKSUM_SHA256;

/*
 * These libumem hooks provide a reasonable set of defaults for the allocator's
 * debugging facilities.
 */
const char *
_umem_debug_init()
{
      return ("default,verbose"); /* $UMEM_DEBUG setting */
}

const char *
_umem_logging_init(void)
{
      return ("fail,contents"); /* $UMEM_LOGGING setting */
}

static void
usage(void)
{
      (void) fprintf(stderr,
          "Usage: %s [-udibcsvL] [-U cachefile_path] [-t txg]\n"
          "\t   [-S user:cksumalg] "
          "dataset [object...]\n"
          "       %s -C [pool]\n"
          "       %s -l dev\n"
          "       %s -R pool:vdev:offset:size:flags\n"
          "       %s [-p path_to_vdev_dir]\n"
          "       %s -e pool | GUID | devid ...\n",
          cmdname, cmdname, cmdname, cmdname, cmdname, cmdname);

      (void) fprintf(stderr, "      -u uberblock\n");
      (void) fprintf(stderr, "      -d datasets\n");
      (void) fprintf(stderr, "        -C cached pool configuration\n");
      (void) fprintf(stderr, "      -i intent logs\n");
      (void) fprintf(stderr, "      -b block statistics\n");
      (void) fprintf(stderr, "      -m metaslabs\n");
      (void) fprintf(stderr, "      -c checksum all metadata (twice for "
          "all data) blocks\n");
      (void) fprintf(stderr, "      -s report stats on zdb's I/O\n");
      (void) fprintf(stderr, "      -S <user|all>:<cksum_alg|all> -- "
          "dump blkptr signatures\n");
      (void) fprintf(stderr, "      -v verbose (applies to all others)\n");
      (void) fprintf(stderr, "        -l dump label contents\n");
      (void) fprintf(stderr, "        -L disable leak tracking (do not "
          "load spacemaps)\n");
      (void) fprintf(stderr, "      -U cachefile_path -- use alternate "
          "cachefile\n");
      (void) fprintf(stderr, "        -R read and display block from a "
          "device\n");
      (void) fprintf(stderr, "        -e Pool is exported/destroyed/"
          "has altroot\n");
      (void) fprintf(stderr, "      -p <Path to vdev dir> (use with -e)\n");
      (void) fprintf(stderr, "      -t <txg> highest txg to use when "
          "searching for uberblocks\n");
      (void) fprintf(stderr, "Specify an option more than once (e.g. -bb) "
          "to make only that option verbose\n");
      (void) fprintf(stderr, "Default is to dump everything non-verbosely\n");
      exit(1);
}

/*
 * Called for usage errors that are discovered after a call to spa_open(),
 * dmu_bonus_hold(), or pool_match().  abort() is called for other errors.
 */

static void
fatal(const char *fmt, ...)
{
      va_list ap;

      va_start(ap, fmt);
      (void) fprintf(stderr, "%s: ", cmdname);
      (void) vfprintf(stderr, fmt, ap);
      va_end(ap);
      (void) fprintf(stderr, "\n");

      exit(1);
}

static void
dump_nvlist(nvlist_t *list, int indent)
{
      nvpair_t *elem = NULL;

      while ((elem = nvlist_next_nvpair(list, elem)) != NULL) {
            switch (nvpair_type(elem)) {
            case DATA_TYPE_STRING:
                  {
                        char *value;

                        VERIFY(nvpair_value_string(elem, &value) == 0);
                        (void) printf("%*s%s='%s'\n", indent, "",
                            nvpair_name(elem), value);
                  }
                  break;

            case DATA_TYPE_UINT64:
                  {
                        uint64_t value;

                        VERIFY(nvpair_value_uint64(elem, &value) == 0);
                        (void) printf("%*s%s=%llu\n", indent, "",
                            nvpair_name(elem), (u_longlong_t)value);
                  }
                  break;

            case DATA_TYPE_NVLIST:
                  {
                        nvlist_t *value;

                        VERIFY(nvpair_value_nvlist(elem, &value) == 0);
                        (void) printf("%*s%s\n", indent, "",
                            nvpair_name(elem));
                        dump_nvlist(value, indent + 4);
                  }
                  break;

            case DATA_TYPE_NVLIST_ARRAY:
                  {
                        nvlist_t **value;
                        uint_t c, count;

                        VERIFY(nvpair_value_nvlist_array(elem, &value,
                            &count) == 0);

                        for (c = 0; c < count; c++) {
                              (void) printf("%*s%s[%u]\n", indent, "",
                                  nvpair_name(elem), c);
                              dump_nvlist(value[c], indent + 8);
                        }
                  }
                  break;

            default:

                  (void) printf("bad config type %d for %s\n",
                      nvpair_type(elem), nvpair_name(elem));
            }
      }
}

/* ARGSUSED */
static void
dump_packed_nvlist(objset_t *os, uint64_t object, void *data, size_t size)
{
      nvlist_t *nv;
      size_t nvsize = *(uint64_t *)data;
      char *packed = umem_alloc(nvsize, UMEM_NOFAIL);

      VERIFY(0 == dmu_read(os, object, 0, nvsize, packed, DMU_READ_PREFETCH));

      VERIFY(nvlist_unpack(packed, nvsize, &nv, 0) == 0);

      umem_free(packed, nvsize);

      dump_nvlist(nv, 8);

      nvlist_free(nv);
}

const char dump_zap_stars[] = "****************************************";
const int dump_zap_width = sizeof (dump_zap_stars) - 1;

static void
dump_zap_histogram(uint64_t histo[ZAP_HISTOGRAM_SIZE])
{
      int i;
      int minidx = ZAP_HISTOGRAM_SIZE - 1;
      int maxidx = 0;
      uint64_t max = 0;

      for (i = 0; i < ZAP_HISTOGRAM_SIZE; i++) {
            if (histo[i] > max)
                  max = histo[i];
            if (histo[i] > 0 && i > maxidx)
                  maxidx = i;
            if (histo[i] > 0 && i < minidx)
                  minidx = i;
      }

      if (max < dump_zap_width)
            max = dump_zap_width;

      for (i = minidx; i <= maxidx; i++)
            (void) printf("\t\t\t%u: %6llu %s\n", i, (u_longlong_t)histo[i],
                &dump_zap_stars[(max - histo[i]) * dump_zap_width / max]);
}

static void
dump_zap_stats(objset_t *os, uint64_t object)
{
      int error;
      zap_stats_t zs;

      error = zap_get_stats(os, object, &zs);
      if (error)
            return;

      if (zs.zs_ptrtbl_len == 0) {
            ASSERT(zs.zs_num_blocks == 1);
            (void) printf("\tmicrozap: %llu bytes, %llu entries\n",
                (u_longlong_t)zs.zs_blocksize,
                (u_longlong_t)zs.zs_num_entries);
            return;
      }

      (void) printf("\tFat ZAP stats:\n");

      (void) printf("\t\tPointer table:\n");
      (void) printf("\t\t\t%llu elements\n",
          (u_longlong_t)zs.zs_ptrtbl_len);
      (void) printf("\t\t\tzt_blk: %llu\n",
          (u_longlong_t)zs.zs_ptrtbl_zt_blk);
      (void) printf("\t\t\tzt_numblks: %llu\n",
          (u_longlong_t)zs.zs_ptrtbl_zt_numblks);
      (void) printf("\t\t\tzt_shift: %llu\n",
          (u_longlong_t)zs.zs_ptrtbl_zt_shift);
      (void) printf("\t\t\tzt_blks_copied: %llu\n",
          (u_longlong_t)zs.zs_ptrtbl_blks_copied);
      (void) printf("\t\t\tzt_nextblk: %llu\n",
          (u_longlong_t)zs.zs_ptrtbl_nextblk);

      (void) printf("\t\tZAP entries: %llu\n",
          (u_longlong_t)zs.zs_num_entries);
      (void) printf("\t\tLeaf blocks: %llu\n",
          (u_longlong_t)zs.zs_num_leafs);
      (void) printf("\t\tTotal blocks: %llu\n",
          (u_longlong_t)zs.zs_num_blocks);
      (void) printf("\t\tzap_block_type: 0x%llx\n",
          (u_longlong_t)zs.zs_block_type);
      (void) printf("\t\tzap_magic: 0x%llx\n",
          (u_longlong_t)zs.zs_magic);
      (void) printf("\t\tzap_salt: 0x%llx\n",
          (u_longlong_t)zs.zs_salt);

      (void) printf("\t\tLeafs with 2^n pointers:\n");
      dump_zap_histogram(zs.zs_leafs_with_2n_pointers);

      (void) printf("\t\tBlocks with n*5 entries:\n");
      dump_zap_histogram(zs.zs_blocks_with_n5_entries);

      (void) printf("\t\tBlocks n/10 full:\n");
      dump_zap_histogram(zs.zs_blocks_n_tenths_full);

      (void) printf("\t\tEntries with n chunks:\n");
      dump_zap_histogram(zs.zs_entries_using_n_chunks);

      (void) printf("\t\tBuckets with n entries:\n");
      dump_zap_histogram(zs.zs_buckets_with_n_entries);
}

/*ARGSUSED*/
static void
dump_none(objset_t *os, uint64_t object, void *data, size_t size)
{
}

/*ARGSUSED*/
void
dump_uint8(objset_t *os, uint64_t object, void *data, size_t size)
{
}

/*ARGSUSED*/
static void
dump_uint64(objset_t *os, uint64_t object, void *data, size_t size)
{
}

/*ARGSUSED*/
static void
dump_zap(objset_t *os, uint64_t object, void *data, size_t size)
{
      zap_cursor_t zc;
      zap_attribute_t attr;
      void *prop;
      int i;

      dump_zap_stats(os, object);
      (void) printf("\n");

      for (zap_cursor_init(&zc, os, object);
          zap_cursor_retrieve(&zc, &attr) == 0;
          zap_cursor_advance(&zc)) {
            (void) printf("\t\t%s = ", attr.za_name);
            if (attr.za_num_integers == 0) {
                  (void) printf("\n");
                  continue;
            }
            prop = umem_zalloc(attr.za_num_integers *
                attr.za_integer_length, UMEM_NOFAIL);
            (void) zap_lookup(os, object, attr.za_name,
                attr.za_integer_length, attr.za_num_integers, prop);
            if (attr.za_integer_length == 1) {
                  (void) printf("%s", (char *)prop);
            } else {
                  for (i = 0; i < attr.za_num_integers; i++) {
                        switch (attr.za_integer_length) {
                        case 2:
                              (void) printf("%u ",
                                  ((uint16_t *)prop)[i]);
                              break;
                        case 4:
                              (void) printf("%u ",
                                  ((uint32_t *)prop)[i]);
                              break;
                        case 8:
                              (void) printf("%lld ",
                                  (u_longlong_t)((int64_t *)prop)[i]);
                              break;
                        }
                  }
            }
            (void) printf("\n");
            umem_free(prop, attr.za_num_integers * attr.za_integer_length);
      }
      zap_cursor_fini(&zc);
}

/*ARGSUSED*/
static void
dump_zpldir(objset_t *os, uint64_t object, void *data, size_t size)
{
      zap_cursor_t zc;
      zap_attribute_t attr;
      const char *typenames[] = {
            /* 0 */ "not specified",
            /* 1 */ "FIFO",
            /* 2 */ "Character Device",
            /* 3 */ "3 (invalid)",
            /* 4 */ "Directory",
            /* 5 */ "5 (invalid)",
            /* 6 */ "Block Device",
            /* 7 */ "7 (invalid)",
            /* 8 */ "Regular File",
            /* 9 */ "9 (invalid)",
            /* 10 */ "Symbolic Link",
            /* 11 */ "11 (invalid)",
            /* 12 */ "Socket",
            /* 13 */ "Door",
            /* 14 */ "Event Port",
            /* 15 */ "15 (invalid)",
      };

      dump_zap_stats(os, object);
      (void) printf("\n");

      for (zap_cursor_init(&zc, os, object);
          zap_cursor_retrieve(&zc, &attr) == 0;
          zap_cursor_advance(&zc)) {
            (void) printf("\t\t%s = %lld (type: %s)\n",
                attr.za_name, (longlong_t) ZFS_DIRENT_OBJ(attr.za_first_integer),
                typenames[ZFS_DIRENT_TYPE(attr.za_first_integer)]);
      }
      zap_cursor_fini(&zc);
}

static void
dump_spacemap(objset_t *os, space_map_obj_t *smo, space_map_t *sm)
{
      uint64_t alloc, offset, entry;
      uint8_t mapshift = sm->sm_shift;
      uint64_t mapstart = sm->sm_start;
      char *ddata[] = { "ALLOC", "FREE", "CONDENSE", "INVALID",
                      "INVALID", "INVALID", "INVALID", "INVALID" };

      if (smo->smo_object == 0)
            return;

      /*
       * Print out the freelist entries in both encoded and decoded form.
       */
      alloc = 0;
      for (offset = 0; offset < smo->smo_objsize; offset += sizeof (entry)) {
            VERIFY(0 == dmu_read(os, smo->smo_object, offset,
                sizeof (entry), &entry, DMU_READ_PREFETCH));
            if (SM_DEBUG_DECODE(entry)) {
                  (void) printf("\t\t[%4llu] %s: txg %llu, pass %llu\n",
                      (u_longlong_t)(offset / sizeof (entry)),
                      ddata[SM_DEBUG_ACTION_DECODE(entry)],
                      (u_longlong_t)SM_DEBUG_TXG_DECODE(entry),
                      (u_longlong_t)SM_DEBUG_SYNCPASS_DECODE(entry));
            } else {
                  (void) printf("\t\t[%4llu]    %c  range:"
                      " %08llx-%08llx  size: %06llx\n",
                      (u_longlong_t)(offset / sizeof (entry)),
                      SM_TYPE_DECODE(entry) == SM_ALLOC ? 'A' : 'F',
                      (u_longlong_t)((SM_OFFSET_DECODE(entry) <<
                      mapshift) + mapstart),
                      (u_longlong_t)((SM_OFFSET_DECODE(entry) <<
                      mapshift) + mapstart + (SM_RUN_DECODE(entry) <<
                      mapshift)),
                      (u_longlong_t)(SM_RUN_DECODE(entry) << mapshift));
                  if (SM_TYPE_DECODE(entry) == SM_ALLOC)
                        alloc += SM_RUN_DECODE(entry) << mapshift;
                  else
                        alloc -= SM_RUN_DECODE(entry) << mapshift;
            }
      }
      if (alloc != smo->smo_alloc) {
            (void) printf("space_map_object alloc (%llu) INCONSISTENT "
                "with space map summary (%llu)\n",
                (u_longlong_t)smo->smo_alloc, (u_longlong_t)alloc);
      }
}

static void
dump_metaslab_stats(metaslab_t *msp)
{
      char maxbuf[5];
      space_map_t *sm = &msp->ms_map;
      avl_tree_t *t = sm->sm_pp_root;
      int free_pct = sm->sm_space * 100 / sm->sm_size;

      nicenum(space_map_maxsize(sm), maxbuf);

      (void) printf("\t %20s %10lu   %7s  %6s   %4s %4d%%\n",
          "segments", avl_numnodes(t), "maxsize", maxbuf,
          "freepct", free_pct);
}

static void
dump_metaslab(metaslab_t *msp)
{
      char freebuf[5];
      space_map_obj_t *smo = &msp->ms_smo;
      vdev_t *vd = msp->ms_group->mg_vd;
      spa_t *spa = vd->vdev_spa;

      nicenum(msp->ms_map.sm_size - smo->smo_alloc, freebuf);

      (void) printf(
          "\tvdev %5llu   offset %12llx   spacemap %6llu   free    %5s\n",
          (u_longlong_t)vd->vdev_id, (u_longlong_t)msp->ms_map.sm_start,
          (u_longlong_t)smo->smo_object, freebuf);

      if (dump_opt['m'] > 1) {
            mutex_enter(&msp->ms_lock);
            VERIFY(space_map_load(&msp->ms_map, zfs_metaslab_ops,
                SM_FREE, &msp->ms_smo, spa->spa_meta_objset) == 0);
            dump_metaslab_stats(msp);
            space_map_unload(&msp->ms_map);
            mutex_exit(&msp->ms_lock);
      }

      if (dump_opt['d'] > 5 || dump_opt['m'] > 2) {
            ASSERT(msp->ms_map.sm_size == (1ULL << vd->vdev_ms_shift));

            mutex_enter(&msp->ms_lock);
            dump_spacemap(spa->spa_meta_objset, smo, &msp->ms_map);
            mutex_exit(&msp->ms_lock);
      }

}

static void
dump_metaslabs(spa_t *spa)
{
      vdev_t *rvd = spa->spa_root_vdev;
      vdev_t *vd;
      int c, m;

      (void) printf("\nMetaslabs:\n");

      for (c = 0; c < rvd->vdev_children; c++) {
            vd = rvd->vdev_child[c];

            (void) printf("\t%-10s   %-19s   %-15s   %-10s\n",
                "vdev", "offset", "spacemap", "free");
            (void) printf("\t%10s   %19s   %15s   %10s\n",
                "----------", "-------------------",
                "---------------", "-------------");

            for (m = 0; m < vd->vdev_ms_count; m++)
                  dump_metaslab(vd->vdev_ms[m]);
            (void) printf("\n");
      }
}

static void
dump_dtl_seg(space_map_t *sm, uint64_t start, uint64_t size)
{
      char *prefix = (void *)sm;

      (void) printf("%s [%llu,%llu) length %llu\n",
          prefix,
          (u_longlong_t)start,
          (u_longlong_t)(start + size),
          (u_longlong_t)(size));
}

static void
dump_dtl(vdev_t *vd, int indent)
{
      spa_t *spa = vd->vdev_spa;
      boolean_t required;
      char *name[DTL_TYPES] = { "missing", "partial", "scrub", "outage" };
      char prefix[256];

      spa_vdev_state_enter(spa);
      required = vdev_dtl_required(vd);
      (void) spa_vdev_state_exit(spa, NULL, 0);

      if (indent == 0)
            (void) printf("\nDirty time logs:\n\n");

      (void) printf("\t%*s%s [%s]\n", indent, "",
          vd->vdev_path ? vd->vdev_path :
          vd->vdev_parent ? vd->vdev_ops->vdev_op_type : spa_name(spa),
          required ? "DTL-required" : "DTL-expendable");

      for (int t = 0; t < DTL_TYPES; t++) {
            space_map_t *sm = &vd->vdev_dtl[t];
            if (sm->sm_space == 0)
                  continue;
            (void) snprintf(prefix, sizeof (prefix), "\t%*s%s",
                indent + 2, "", name[t]);
            mutex_enter(sm->sm_lock);
            space_map_walk(sm, dump_dtl_seg, (void *)prefix);
            mutex_exit(sm->sm_lock);
            if (dump_opt['d'] > 5 && vd->vdev_children == 0)
                  dump_spacemap(spa->spa_meta_objset,
                      &vd->vdev_dtl_smo, sm);
      }

      for (int c = 0; c < vd->vdev_children; c++)
            dump_dtl(vd->vdev_child[c], indent + 4);
}

/*ARGSUSED*/
static void
dump_dnode(objset_t *os, uint64_t object, void *data, size_t size)
{
}

static uint64_t
blkid2offset(const dnode_phys_t *dnp, int level, uint64_t blkid)
{
      if (level < 0)
            return (blkid);

      return ((blkid << (level * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT))) *
          dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT);
}

static void
sprintf_blkptr_compact(char *blkbuf, blkptr_t *bp, int alldvas)
{
      dva_t *dva = bp->blk_dva;
      int ndvas = alldvas ? BP_GET_NDVAS(bp) : 1;
      int i;

      blkbuf[0] = '\0';

      for (i = 0; i < ndvas; i++)
            (void) sprintf(blkbuf + strlen(blkbuf), "%llu:%llx:%llx ",
                (u_longlong_t)DVA_GET_VDEV(&dva[i]),
                (u_longlong_t)DVA_GET_OFFSET(&dva[i]),
                (u_longlong_t)DVA_GET_ASIZE(&dva[i]));

      (void) sprintf(blkbuf + strlen(blkbuf), "%llxL/%llxP F=%llu B=%llu",
          (u_longlong_t)BP_GET_LSIZE(bp),
          (u_longlong_t)BP_GET_PSIZE(bp),
          (u_longlong_t)bp->blk_fill,
          (u_longlong_t)bp->blk_birth);
}

static void
print_indirect(blkptr_t *bp, const zbookmark_t *zb,
    const dnode_phys_t *dnp)
{
      char blkbuf[BP_SPRINTF_LEN];
      int l;

      ASSERT3U(BP_GET_TYPE(bp), ==, dnp->dn_type);
      ASSERT3U(BP_GET_LEVEL(bp), ==, zb->zb_level);

      (void) printf("%16llx ",
          (u_longlong_t)blkid2offset(dnp, zb->zb_level, zb->zb_blkid));

      ASSERT(zb->zb_level >= 0);

      for (l = dnp->dn_nlevels - 1; l >= -1; l--) {
            if (l == zb->zb_level) {
                  (void) printf("L%llx", (u_longlong_t)zb->zb_level);
            } else {
                  (void) printf(" ");
            }
      }

      sprintf_blkptr_compact(blkbuf, bp, dump_opt['d'] > 5 ? 1 : 0);
      (void) printf("%s\n", blkbuf);
}

#define     SET_BOOKMARK(zb, objset, object, level, blkid)  \
{                                                       \
      (zb)->zb_objset = objset;                       \
      (zb)->zb_object = object;                       \
      (zb)->zb_level = level;                         \
      (zb)->zb_blkid = blkid;                         \
}

static int
visit_indirect(spa_t *spa, const dnode_phys_t *dnp,
    blkptr_t *bp, const zbookmark_t *zb)
{
      int err;

      if (bp->blk_birth == 0)
            return (0);

      print_indirect(bp, zb, dnp);

      if (BP_GET_LEVEL(bp) > 0) {
            uint32_t flags = ARC_WAIT;
            int i;
            blkptr_t *cbp;
            int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT;
            arc_buf_t *buf;
            uint64_t fill = 0;

            err = arc_read_nolock(NULL, spa, bp, arc_getbuf_func, &buf,
                ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
            if (err)
                  return (err);

            /* recursively visit blocks below this */
            cbp = buf->b_data;
            for (i = 0; i < epb; i++, cbp++) {
                  zbookmark_t czb;

                  SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object,
                      zb->zb_level - 1,
                      zb->zb_blkid * epb + i);
                  err = visit_indirect(spa, dnp, cbp, &czb);
                  if (err)
                        break;
                  fill += cbp->blk_fill;
            }
            if (!err)
                  ASSERT3U(fill, ==, bp->blk_fill);
            (void) arc_buf_remove_ref(buf, &buf);
      }

      return (err);
}

/*ARGSUSED*/
static void
dump_indirect(dnode_t *dn)
{
      dnode_phys_t *dnp = dn->dn_phys;
      int j;
      zbookmark_t czb;

      (void) printf("Indirect blocks:\n");

      SET_BOOKMARK(&czb, dmu_objset_id(&dn->dn_objset->os),
          dn->dn_object, dnp->dn_nlevels - 1, 0);
      for (j = 0; j < dnp->dn_nblkptr; j++) {
            czb.zb_blkid = j;
            (void) visit_indirect(dmu_objset_spa(&dn->dn_objset->os), dnp,
                &dnp->dn_blkptr[j], &czb);
      }

      (void) printf("\n");
}

/*ARGSUSED*/
static void
dump_dsl_dir(objset_t *os, uint64_t object, void *data, size_t size)
{
      dsl_dir_phys_t *dd = data;
      time_t crtime;
      char nice[6];

      if (dd == NULL)
            return;

      ASSERT3U(size, >=, sizeof (dsl_dir_phys_t));

      crtime = dd->dd_creation_time;
      (void) printf("\t\tcreation_time = %s", ctime(&crtime));
      (void) printf("\t\thead_dataset_obj = %llu\n",
          (u_longlong_t)dd->dd_head_dataset_obj);
      (void) printf("\t\tparent_dir_obj = %llu\n",
          (u_longlong_t)dd->dd_parent_obj);
      (void) printf("\t\torigin_obj = %llu\n",
          (u_longlong_t)dd->dd_origin_obj);
      (void) printf("\t\tchild_dir_zapobj = %llu\n",
          (u_longlong_t)dd->dd_child_dir_zapobj);
      nicenum(dd->dd_used_bytes, nice);
      (void) printf("\t\tused_bytes = %s\n", nice);
      nicenum(dd->dd_compressed_bytes, nice);
      (void) printf("\t\tcompressed_bytes = %s\n", nice);
      nicenum(dd->dd_uncompressed_bytes, nice);
      (void) printf("\t\tuncompressed_bytes = %s\n", nice);
      nicenum(dd->dd_quota, nice);
      (void) printf("\t\tquota = %s\n", nice);
      nicenum(dd->dd_reserved, nice);
      (void) printf("\t\treserved = %s\n", nice);
      (void) printf("\t\tprops_zapobj = %llu\n",
          (u_longlong_t)dd->dd_props_zapobj);
      (void) printf("\t\tdeleg_zapobj = %llu\n",
          (u_longlong_t)dd->dd_deleg_zapobj);
      (void) printf("\t\tflags = %llx\n",
          (u_longlong_t)dd->dd_flags);

#define     DO(which) \
      nicenum(dd->dd_used_breakdown[DD_USED_ ## which], nice); \
      (void) printf("\t\tused_breakdown[" #which "] = %s\n", nice)
      DO(HEAD);
      DO(SNAP);
      DO(CHILD);
      DO(CHILD_RSRV);
      DO(REFRSRV);
#undef DO
}

/*ARGSUSED*/
static void
dump_dsl_dataset(objset_t *os, uint64_t object, void *data, size_t size)
{
      dsl_dataset_phys_t *ds = data;
      time_t crtime;
      char used[6], compressed[6], uncompressed[6], unique[6];
      char blkbuf[BP_SPRINTF_LEN];

      if (ds == NULL)
            return;

      ASSERT(size == sizeof (*ds));
      crtime = ds->ds_creation_time;
      nicenum(ds->ds_used_bytes, used);
      nicenum(ds->ds_compressed_bytes, compressed);
      nicenum(ds->ds_uncompressed_bytes, uncompressed);
      nicenum(ds->ds_unique_bytes, unique);
      sprintf_blkptr(blkbuf, BP_SPRINTF_LEN, &ds->ds_bp);

      (void) printf("\t\tdir_obj = %llu\n",
          (u_longlong_t)ds->ds_dir_obj);
      (void) printf("\t\tprev_snap_obj = %llu\n",
          (u_longlong_t)ds->ds_prev_snap_obj);
      (void) printf("\t\tprev_snap_txg = %llu\n",
          (u_longlong_t)ds->ds_prev_snap_txg);
      (void) printf("\t\tnext_snap_obj = %llu\n",
          (u_longlong_t)ds->ds_next_snap_obj);
      (void) printf("\t\tsnapnames_zapobj = %llu\n",
          (u_longlong_t)ds->ds_snapnames_zapobj);
      (void) printf("\t\tnum_children = %llu\n",
          (u_longlong_t)ds->ds_num_children);
      (void) printf("\t\tcreation_time = %s", ctime(&crtime));
      (void) printf("\t\tcreation_txg = %llu\n",
          (u_longlong_t)ds->ds_creation_txg);
      (void) printf("\t\tdeadlist_obj = %llu\n",
          (u_longlong_t)ds->ds_deadlist_obj);
      (void) printf("\t\tused_bytes = %s\n", used);
      (void) printf("\t\tcompressed_bytes = %s\n", compressed);
      (void) printf("\t\tuncompressed_bytes = %s\n", uncompressed);
      (void) printf("\t\tunique = %s\n", unique);
      (void) printf("\t\tfsid_guid = %llu\n",
          (u_longlong_t)ds->ds_fsid_guid);
      (void) printf("\t\tguid = %llu\n",
          (u_longlong_t)ds->ds_guid);
      (void) printf("\t\tflags = %llx\n",
          (u_longlong_t)ds->ds_flags);
      (void) printf("\t\tnext_clones_obj = %llu\n",
          (u_longlong_t)ds->ds_next_clones_obj);
      (void) printf("\t\tprops_obj = %llu\n",
          (u_longlong_t)ds->ds_props_obj);
      (void) printf("\t\tbp = %s\n", blkbuf);
}

static void
dump_bplist(objset_t *mos, uint64_t object, char *name)
{
      bplist_t bpl = { 0 };
      blkptr_t blk, *bp = &blk;
      uint64_t itor = 0;
      char bytes[6];
      char comp[6];
      char uncomp[6];

      if (dump_opt['d'] < 3)
            return;

      mutex_init(&bpl.bpl_lock, NULL, MUTEX_DEFAULT, NULL);
      VERIFY(0 == bplist_open(&bpl, mos, object));
      if (bplist_empty(&bpl)) {
            bplist_close(&bpl);
            mutex_destroy(&bpl.bpl_lock);
            return;
      }

      nicenum(bpl.bpl_phys->bpl_bytes, bytes);
      if (bpl.bpl_dbuf->db_size == sizeof (bplist_phys_t)) {
            nicenum(bpl.bpl_phys->bpl_comp, comp);
            nicenum(bpl.bpl_phys->bpl_uncomp, uncomp);
            (void) printf("\n    %s: %llu entries, %s (%s/%s comp)\n",
                name, (u_longlong_t)bpl.bpl_phys->bpl_entries,
                bytes, comp, uncomp);
      } else {
            (void) printf("\n    %s: %llu entries, %s\n",
                name, (u_longlong_t)bpl.bpl_phys->bpl_entries, bytes);
      }

      if (dump_opt['d'] < 5) {
            bplist_close(&bpl);
            mutex_destroy(&bpl.bpl_lock);
            return;
      }

      (void) printf("\n");

      while (bplist_iterate(&bpl, &itor, bp) == 0) {
            char blkbuf[BP_SPRINTF_LEN];

            ASSERT(bp->blk_birth != 0);
            sprintf_blkptr_compact(blkbuf, bp, dump_opt['d'] > 5 ? 1 : 0);
            (void) printf("\tItem %3llu: %s\n",
                (u_longlong_t)itor - 1, blkbuf);
      }

      bplist_close(&bpl);
      mutex_destroy(&bpl.bpl_lock);
}

static avl_tree_t idx_tree;
static avl_tree_t domain_tree;
static boolean_t fuid_table_loaded;

static void
fuid_table_destroy()
{
      if (fuid_table_loaded) {
            zfs_fuid_table_destroy(&idx_tree, &domain_tree);
            fuid_table_loaded = B_FALSE;
      }
}

/*
 * print uid or gid information.
 * For normal POSIX id just the id is printed in decimal format.
 * For CIFS files with FUID the fuid is printed in hex followed by
 * the doman-rid string.
 */
static void
print_idstr(uint64_t id, const char *id_type)
{
      if (FUID_INDEX(id)) {
            char *domain;

            domain = zfs_fuid_idx_domain(&idx_tree, FUID_INDEX(id));
            (void) printf("\t%s     %llx [%s-%d]\n", id_type,
                (u_longlong_t)id, domain, (int)FUID_RID(id));
      } else {
            (void) printf("\t%s     %llu\n", id_type, (u_longlong_t)id);
      }

}

static void
dump_uidgid(objset_t *os, znode_phys_t *zp)
{
      uint32_t uid_idx, gid_idx;

      uid_idx = FUID_INDEX(zp->zp_uid);
      gid_idx = FUID_INDEX(zp->zp_gid);

      /* Load domain table, if not already loaded */
      if (!fuid_table_loaded && (uid_idx || gid_idx)) {
            uint64_t fuid_obj;

            /* first find the fuid object.  It lives in the master node */
            VERIFY(zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES,
                8, 1, &fuid_obj) == 0);
            zfs_fuid_avl_tree_create(&idx_tree, &domain_tree);
            (void) zfs_fuid_table_load(os, fuid_obj,
                &idx_tree, &domain_tree);
            fuid_table_loaded = B_TRUE;
      }

      print_idstr(zp->zp_uid, "uid");
      print_idstr(zp->zp_gid, "gid");
}

/*ARGSUSED*/
static void
dump_znode(objset_t *os, uint64_t object, void *data, size_t size)
{
      znode_phys_t *zp = data;
      time_t z_crtime, z_atime, z_mtime, z_ctime;
      char path[MAXPATHLEN * 2];    /* allow for xattr and failure prefix */
      int error;

      ASSERT(size >= sizeof (znode_phys_t));

      error = zfs_obj_to_path(os, object, path, sizeof (path));
      if (error != 0) {
            (void) snprintf(path, sizeof (path), "\?\?\?<object#%llu>",
                (u_longlong_t)object);
      }

      if (dump_opt['d'] < 3) {
            (void) printf("\t%s\n", path);
            return;
      }

      z_crtime = (time_t)zp->zp_crtime[0];
      z_atime = (time_t)zp->zp_atime[0];
      z_mtime = (time_t)zp->zp_mtime[0];
      z_ctime = (time_t)zp->zp_ctime[0];

      (void) printf("\tpath   %s\n", path);
      dump_uidgid(os, zp);
      (void) printf("\tatime  %s", ctime(&z_atime));
      (void) printf("\tmtime  %s", ctime(&z_mtime));
      (void) printf("\tctime  %s", ctime(&z_ctime));
      (void) printf("\tcrtime %s", ctime(&z_crtime));
      (void) printf("\tgen    %llu\n", (u_longlong_t)zp->zp_gen);
      (void) printf("\tmode   %llo\n", (u_longlong_t)zp->zp_mode);
      (void) printf("\tsize   %llu\n", (u_longlong_t)zp->zp_size);
      (void) printf("\tparent %llu\n", (u_longlong_t)zp->zp_parent);
      (void) printf("\tlinks  %llu\n", (u_longlong_t)zp->zp_links);
      (void) printf("\txattr  %llu\n", (u_longlong_t)zp->zp_xattr);
      (void) printf("\trdev   0x%016llx\n", (u_longlong_t)zp->zp_rdev);
}

/*ARGSUSED*/
static void
dump_acl(objset_t *os, uint64_t object, void *data, size_t size)
{
}

/*ARGSUSED*/
static void
dump_dmu_objset(objset_t *os, uint64_t object, void *data, size_t size)
{
}

static object_viewer_t *object_viewer[DMU_OT_NUMTYPES] = {
      dump_none,        /* unallocated                */
      dump_zap,         /* object directory           */
      dump_uint64,            /* object array               */
      dump_none,        /* packed nvlist        */
      dump_packed_nvlist,     /* packed nvlist size         */
      dump_none,        /* bplist               */
      dump_none,        /* bplist header        */
      dump_none,        /* SPA space map header       */
      dump_none,        /* SPA space map        */
      dump_none,        /* ZIL intent log       */
      dump_dnode,       /* DMU dnode                  */
      dump_dmu_objset,  /* DMU objset                 */
      dump_dsl_dir,           /* DSL directory        */
      dump_zap,         /* DSL directory child map    */
      dump_zap,         /* DSL dataset snap map       */
      dump_zap,         /* DSL props                  */
      dump_dsl_dataset, /* DSL dataset                */
      dump_znode,       /* ZFS znode                  */
      dump_acl,         /* ZFS V0 ACL                 */
      dump_uint8,       /* ZFS plain file       */
      dump_zpldir,            /* ZFS directory        */
      dump_zap,         /* ZFS master node            */
      dump_zap,         /* ZFS delete queue           */
      dump_uint8,       /* zvol object                */
      dump_zap,         /* zvol prop                  */
      dump_uint8,       /* other uint8[]        */
      dump_uint64,            /* other uint64[]       */
      dump_zap,         /* other ZAP                  */
      dump_zap,         /* persistent error log       */
      dump_uint8,       /* SPA history                */
      dump_uint64,            /* SPA history offsets        */
      dump_zap,         /* Pool properties            */
      dump_zap,         /* DSL permissions            */
      dump_acl,         /* ZFS ACL              */
      dump_uint8,       /* ZFS SYSACL                 */
      dump_none,        /* FUID nvlist                */
      dump_packed_nvlist,     /* FUID nvlist size           */
      dump_zap,         /* DSL dataset next clones    */
      dump_zap,         /* DSL scrub queue            */
      dump_zap,         /* ZFS user/group used        */
      dump_zap,         /* ZFS user/group quota       */
};

static void
dump_object(objset_t *os, uint64_t object, int verbosity, int *print_header)
{
      dmu_buf_t *db = NULL;
      dmu_object_info_t doi;
      dnode_t *dn;
      void *bonus = NULL;
      size_t bsize = 0;
      char iblk[6], dblk[6], lsize[6], asize[6], bonus_size[6], segsize[6];
      char aux[50];
      int error;

      if (*print_header) {
            (void) printf("\n    Object  lvl   iblk   dblk  lsize"
                "  asize  type\n");
            *print_header = 0;
      }

      if (object == 0) {
            dn = os->os->os_meta_dnode;
      } else {
            error = dmu_bonus_hold(os, object, FTAG, &db);
            if (error)
                  fatal("dmu_bonus_hold(%llu) failed, errno %u",
                      object, error);
            bonus = db->db_data;
            bsize = db->db_size;
            dn = ((dmu_buf_impl_t *)db)->db_dnode;
      }
      dmu_object_info_from_dnode(dn, &doi);

      nicenum(doi.doi_metadata_block_size, iblk);
      nicenum(doi.doi_data_block_size, dblk);
      nicenum(doi.doi_data_block_size * (doi.doi_max_block_offset + 1),
          lsize);
      nicenum(doi.doi_physical_blks << 9, asize);
      nicenum(doi.doi_bonus_size, bonus_size);

      aux[0] = '\0';

      if (doi.doi_checksum != ZIO_CHECKSUM_INHERIT || verbosity >= 6) {
            (void) snprintf(aux + strlen(aux), sizeof (aux), " (K=%s)",
                zio_checksum_table[doi.doi_checksum].ci_name);
      }

      if (doi.doi_compress != ZIO_COMPRESS_INHERIT || verbosity >= 6) {
            (void) snprintf(aux + strlen(aux), sizeof (aux), " (Z=%s)",
                zio_compress_table[doi.doi_compress].ci_name);
      }

      (void) printf("%10lld  %3u  %5s  %5s  %5s  %5s  %s%s\n",
          (u_longlong_t)object, doi.doi_indirection, iblk, dblk, lsize,
          asize, dmu_ot[doi.doi_type].ot_name, aux);

      if (doi.doi_bonus_type != DMU_OT_NONE && verbosity > 3) {
            (void) printf("%10s  %3s  %5s  %5s  %5s  %5s  %s\n",
                "", "", "", "", bonus_size, "bonus",
                dmu_ot[doi.doi_bonus_type].ot_name);
      }

      if (verbosity >= 4) {
            (void) printf("\tdnode flags: %s%s\n",
                (dn->dn_phys->dn_flags & DNODE_FLAG_USED_BYTES) ?
                "USED_BYTES " : "",
                (dn->dn_phys->dn_flags & DNODE_FLAG_USERUSED_ACCOUNTED) ?
                "USERUSED_ACCOUNTED " : "");
            (void) printf("\tdnode maxblkid: %llu\n",
                (longlong_t)dn->dn_phys->dn_maxblkid);

            object_viewer[doi.doi_bonus_type](os, object, bonus, bsize);
            object_viewer[doi.doi_type](os, object, NULL, 0);
            *print_header = 1;
      }

      if (verbosity >= 5)
            dump_indirect(dn);

      if (verbosity >= 5) {
            /*
             * Report the list of segments that comprise the object.
             */
            uint64_t start = 0;
            uint64_t end;
            uint64_t blkfill = 1;
            int minlvl = 1;

            if (dn->dn_type == DMU_OT_DNODE) {
                  minlvl = 0;
                  blkfill = DNODES_PER_BLOCK;
            }

            for (;;) {
                  error = dnode_next_offset(dn,
                      0, &start, minlvl, blkfill, 0);
                  if (error)
                        break;
                  end = start;
                  error = dnode_next_offset(dn,
                      DNODE_FIND_HOLE, &end, minlvl, blkfill, 0);
                  nicenum(end - start, segsize);
                  (void) printf("\t\tsegment [%016llx, %016llx)"
                      " size %5s\n", (u_longlong_t)start,
                      (u_longlong_t)end, segsize);
                  if (error)
                        break;
                  start = end;
            }
      }

      if (db != NULL)
            dmu_buf_rele(db, FTAG);
}

static char *objset_types[DMU_OST_NUMTYPES] = {
      "NONE", "META", "ZPL", "ZVOL", "OTHER", "ANY" };

static void
dump_dir(objset_t *os)
{
      dmu_objset_stats_t dds;
      uint64_t object, object_count;
      uint64_t refdbytes, usedobjs, scratch;
      char numbuf[8];
      char blkbuf[BP_SPRINTF_LEN + 20];
      char osname[MAXNAMELEN];
      char *type = "UNKNOWN";
      int verbosity = dump_opt['d'];
      int print_header = 1;
      int i, error;

      dmu_objset_fast_stat(os, &dds);

      if (dds.dds_type < DMU_OST_NUMTYPES)
            type = objset_types[dds.dds_type];

      if (dds.dds_type == DMU_OST_META) {
            dds.dds_creation_txg = TXG_INITIAL;
            usedobjs = os->os->os_rootbp->blk_fill;
            refdbytes = os->os->os_spa->spa_dsl_pool->
                dp_mos_dir->dd_phys->dd_used_bytes;
      } else {
            dmu_objset_space(os, &refdbytes, &scratch, &usedobjs, &scratch);
      }

      ASSERT3U(usedobjs, ==, os->os->os_rootbp->blk_fill);

      nicenum(refdbytes, numbuf);

      if (verbosity >= 4) {
            (void) sprintf(blkbuf + strlen(blkbuf), ", rootbp ");
            (void) sprintf_blkptr(blkbuf + strlen(blkbuf),
                BP_SPRINTF_LEN - strlen(blkbuf), os->os->os_rootbp);
      } else {
            blkbuf[0] = '\0';
      }

      dmu_objset_name(os, osname);

      (void) printf("Dataset %s [%s], ID %llu, cr_txg %llu, "
          "%s, %llu objects%s\n",
          osname, type, (u_longlong_t)dmu_objset_id(os),
          (u_longlong_t)dds.dds_creation_txg,
          numbuf, (u_longlong_t)usedobjs, blkbuf);

      dump_intent_log(dmu_objset_zil(os));

      if (dmu_objset_ds(os) != NULL)
            dump_bplist(dmu_objset_pool(os)->dp_meta_objset,
                dmu_objset_ds(os)->ds_phys->ds_deadlist_obj, "Deadlist");

      if (verbosity < 2)
            return;

      if (os->os->os_rootbp->blk_birth == 0)
            return;

      if (zopt_objects != 0) {
            for (i = 0; i < zopt_objects; i++)
                  dump_object(os, zopt_object[i], verbosity,
                      &print_header);
            (void) printf("\n");
            return;
      }

      dump_object(os, 0, verbosity, &print_header);
      object_count = 0;
      if (os->os->os_userused_dnode &&
          os->os->os_userused_dnode->dn_type != 0) {
            dump_object(os, DMU_USERUSED_OBJECT, verbosity, &print_header);
            dump_object(os, DMU_GROUPUSED_OBJECT, verbosity, &print_header);
      }

      object = 0;
      while ((error = dmu_object_next(os, &object, B_FALSE, 0)) == 0) {
            dump_object(os, object, verbosity, &print_header);
            object_count++;
      }

      ASSERT3U(object_count, ==, usedobjs);

      (void) printf("\n");

      if (error != ESRCH) {
            (void) fprintf(stderr, "dmu_object_next() = %d\n", error);
            abort();
      }
}

static void
dump_uberblock(uberblock_t *ub)
{
      time_t timestamp = ub->ub_timestamp;

      (void) printf("Uberblock\n\n");
      (void) printf("\tmagic = %016llx\n", (u_longlong_t)ub->ub_magic);
      (void) printf("\tversion = %llu\n", (u_longlong_t)ub->ub_version);
      (void) printf("\ttxg = %llu\n", (u_longlong_t)ub->ub_txg);
      (void) printf("\tguid_sum = %llu\n", (u_longlong_t)ub->ub_guid_sum);
      (void) printf("\ttimestamp = %llu UTC = %s",
          (u_longlong_t)ub->ub_timestamp, asctime(localtime(&timestamp)));
      if (dump_opt['u'] >= 3) {
            char blkbuf[BP_SPRINTF_LEN];
            sprintf_blkptr(blkbuf, BP_SPRINTF_LEN, &ub->ub_rootbp);
            (void) printf("\trootbp = %s\n", blkbuf);
      }
      (void) printf("\n");
}

static void
dump_config(const char *pool)
{
      spa_t *spa = NULL;

      mutex_enter(&spa_namespace_lock);
      while ((spa = spa_next(spa)) != NULL) {
            if (pool == NULL)
                  (void) printf("%s\n", spa_name(spa));
            if (pool == NULL || strcmp(pool, spa_name(spa)) == 0)
                  dump_nvlist(spa->spa_config, 4);
      }
      mutex_exit(&spa_namespace_lock);
}

static void
dump_cachefile(const char *cachefile)
{
      int fd;
      struct stat64 statbuf;
      char *buf;
      nvlist_t *config;

      if ((fd = open64(cachefile, O_RDONLY)) < 0) {
            (void) printf("cannot open '%s': %s\n", cachefile,
                strerror(errno));
            exit(1);
      }

      if (fstat64(fd, &statbuf) != 0) {
            (void) printf("failed to stat '%s': %s\n", cachefile,
                strerror(errno));
            exit(1);
      }

      if ((buf = malloc(statbuf.st_size)) == NULL) {
            (void) fprintf(stderr, "failed to allocate %llu bytes\n",
                (u_longlong_t)statbuf.st_size);
            exit(1);
      }

      if (read(fd, buf, statbuf.st_size) != statbuf.st_size) {
            (void) fprintf(stderr, "failed to read %llu bytes\n",
                (u_longlong_t)statbuf.st_size);
            exit(1);
      }

      (void) close(fd);

      if (nvlist_unpack(buf, statbuf.st_size, &config, 0) != 0) {
            (void) fprintf(stderr, "failed to unpack nvlist\n");
            exit(1);
      }

      free(buf);

      dump_nvlist(config, 0);

      nvlist_free(config);
}

static void
dump_label(const char *dev)
{
      int fd;
      vdev_label_t label;
      char *buf = label.vl_vdev_phys.vp_nvlist;
      size_t buflen = sizeof (label.vl_vdev_phys.vp_nvlist);
      struct stat64 statbuf;
      uint64_t psize;
      int l;

      if ((fd = open64(dev, O_RDONLY)) < 0) {
            (void) printf("cannot open '%s': %s\n", dev, strerror(errno));
            exit(1);
      }

      if (fstat64(fd, &statbuf) != 0) {
            (void) printf("failed to stat '%s': %s\n", dev,
                strerror(errno));
            exit(1);
      }

      psize = statbuf.st_size;
      psize = P2ALIGN(psize, (uint64_t)sizeof (vdev_label_t));

      for (l = 0; l < VDEV_LABELS; l++) {

            nvlist_t *config = NULL;

            (void) printf("--------------------------------------------\n");
            (void) printf("LABEL %d\n", l);
            (void) printf("--------------------------------------------\n");

            if (pread64(fd, &label, sizeof (label),
                vdev_label_offset(psize, l, 0)) != sizeof (label)) {
                  (void) printf("failed to read label %d\n", l);
                  continue;
            }

            if (nvlist_unpack(buf, buflen, &config, 0) != 0) {
                  (void) printf("failed to unpack label %d\n", l);
                  continue;
            }
            dump_nvlist(config, 4);
            nvlist_free(config);
      }
}

/*ARGSUSED*/
static int
dump_one_dir(char *dsname, void *arg)
{
      int error;
      objset_t *os;

      error = dmu_objset_open(dsname, DMU_OST_ANY,
          DS_MODE_USER | DS_MODE_READONLY, &os);
      if (error) {
            (void) printf("Could not open %s\n", dsname);
            return (0);
      }
      dump_dir(os);
      dmu_objset_close(os);
      fuid_table_destroy();
      return (0);
}

static void
zdb_leak(space_map_t *sm, uint64_t start, uint64_t size)
{
      vdev_t *vd = sm->sm_ppd;

      (void) printf("leaked space: vdev %llu, offset 0x%llx, size %llu\n",
          (u_longlong_t)vd->vdev_id, (u_longlong_t)start, (u_longlong_t)size);
}

/* ARGSUSED */
static void
zdb_space_map_load(space_map_t *sm)
{
}

static void
zdb_space_map_unload(space_map_t *sm)
{
      space_map_vacate(sm, zdb_leak, sm);
}

/* ARGSUSED */
static void
zdb_space_map_claim(space_map_t *sm, uint64_t start, uint64_t size)
{
}

static space_map_ops_t zdb_space_map_ops = {
      zdb_space_map_load,
      zdb_space_map_unload,
      NULL, /* alloc */
      zdb_space_map_claim,
      NULL, /* free */
      NULL  /* maxsize */
};

static void
zdb_leak_init(spa_t *spa)
{
      vdev_t *rvd = spa->spa_root_vdev;

      for (int c = 0; c < rvd->vdev_children; c++) {
            vdev_t *vd = rvd->vdev_child[c];
            for (int m = 0; m < vd->vdev_ms_count; m++) {
                  metaslab_t *msp = vd->vdev_ms[m];
                  mutex_enter(&msp->ms_lock);
                  VERIFY(space_map_load(&msp->ms_map, &zdb_space_map_ops,
                      SM_ALLOC, &msp->ms_smo, spa->spa_meta_objset) == 0);
                  msp->ms_map.sm_ppd = vd;
                  mutex_exit(&msp->ms_lock);
            }
      }
}

static void
zdb_leak_fini(spa_t *spa)
{
      vdev_t *rvd = spa->spa_root_vdev;

      for (int c = 0; c < rvd->vdev_children; c++) {
            vdev_t *vd = rvd->vdev_child[c];
            for (int m = 0; m < vd->vdev_ms_count; m++) {
                  metaslab_t *msp = vd->vdev_ms[m];
                  mutex_enter(&msp->ms_lock);
                  space_map_unload(&msp->ms_map);
                  mutex_exit(&msp->ms_lock);
            }
      }
}

/*
 * Verify that the sum of the sizes of all blocks in the pool adds up
 * to the SPA's sa_alloc total.
 */
typedef struct zdb_blkstats {
      uint64_t    zb_asize;
      uint64_t    zb_lsize;
      uint64_t    zb_psize;
      uint64_t    zb_count;
} zdb_blkstats_t;

#define     DMU_OT_DEFERRED   DMU_OT_NONE
#define     DMU_OT_TOTAL      DMU_OT_NUMTYPES

#define     ZB_TOTAL    DN_MAX_LEVELS

typedef struct zdb_cb {
      zdb_blkstats_t    zcb_type[ZB_TOTAL + 1][DMU_OT_TOTAL + 1];
      uint64_t    zcb_errors[256];
      int         zcb_readfails;
      int         zcb_haderrors;
} zdb_cb_t;

static void
zdb_count_block(spa_t *spa, zdb_cb_t *zcb, blkptr_t *bp, dmu_object_type_t type)
{
      for (int i = 0; i < 4; i++) {
            int l = (i < 2) ? BP_GET_LEVEL(bp) : ZB_TOTAL;
            int t = (i & 1) ? type : DMU_OT_TOTAL;
            zdb_blkstats_t *zb = &zcb->zcb_type[l][t];

            zb->zb_asize += BP_GET_ASIZE(bp);
            zb->zb_lsize += BP_GET_LSIZE(bp);
            zb->zb_psize += BP_GET_PSIZE(bp);
            zb->zb_count++;
      }

      if (dump_opt['S']) {
            boolean_t print_sig;

            print_sig = !zdb_sig_user_data || (BP_GET_LEVEL(bp) == 0 &&
                BP_GET_TYPE(bp) == DMU_OT_PLAIN_FILE_CONTENTS);

            if (BP_GET_CHECKSUM(bp) < zdb_sig_cksumalg)
                  print_sig = B_FALSE;

            if (print_sig) {
                  (void) printf("%llu\t%lld\t%lld\t%s\t%s\t%s\t"
                      "%llx:%llx:%llx:%llx\n",
                      (u_longlong_t)BP_GET_LEVEL(bp),
                      (longlong_t)BP_GET_PSIZE(bp),
                      (longlong_t)BP_GET_NDVAS(bp),
                      dmu_ot[BP_GET_TYPE(bp)].ot_name,
                      zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name,
                      zio_compress_table[BP_GET_COMPRESS(bp)].ci_name,
                      (u_longlong_t)bp->blk_cksum.zc_word[0],
                      (u_longlong_t)bp->blk_cksum.zc_word[1],
                      (u_longlong_t)bp->blk_cksum.zc_word[2],
                      (u_longlong_t)bp->blk_cksum.zc_word[3]);
            }
      }

      if (!dump_opt['L'])
            VERIFY(zio_wait(zio_claim(NULL, spa, spa_first_txg(spa), bp,
                NULL, NULL, ZIO_FLAG_MUSTSUCCEED)) == 0);
}

static int
zdb_blkptr_cb(spa_t *spa, blkptr_t *bp, const zbookmark_t *zb,
    const dnode_phys_t *dnp, void *arg)
{
      zdb_cb_t *zcb = arg;
      char blkbuf[BP_SPRINTF_LEN];
      dmu_object_type_t type;
      boolean_t is_l0_metadata;

      if (bp == NULL)
            return (0);

      type = BP_GET_TYPE(bp);

      zdb_count_block(spa, zcb, bp, type);

      /*
       * if we do metadata-only checksumming there's no need to checksum
       * indirect blocks here because it is done during traverse
       */
      is_l0_metadata = (BP_GET_LEVEL(bp) == 0 && type < DMU_OT_NUMTYPES &&
          dmu_ot[type].ot_metadata);

      if (dump_opt['c'] > 1 || dump_opt['S'] ||
          (dump_opt['c'] && is_l0_metadata)) {
            int ioerr, size;
            void *data;

            size = BP_GET_LSIZE(bp);
            data = malloc(size);
            ioerr = zio_wait(zio_read(NULL, spa, bp, data, size,
                NULL, NULL, ZIO_PRIORITY_ASYNC_READ,
                ZIO_FLAG_CANFAIL | ZIO_FLAG_SCRUB, zb));
            free(data);

            /* We expect io errors on intent log */
            if (ioerr && type != DMU_OT_INTENT_LOG) {
                  zcb->zcb_haderrors = 1;
                  zcb->zcb_errors[ioerr]++;

                  if (dump_opt['b'] >= 2)
                        sprintf_blkptr(blkbuf, BP_SPRINTF_LEN, bp);
                  else
                        blkbuf[0] = '\0';

                  if (!dump_opt['S']) {
                        (void) printf("zdb_blkptr_cb: "
                            "Got error %d reading "
                            "<%llu, %llu, %lld, %llx> %s -- skipping\n",
                            ioerr,
                            (u_longlong_t)zb->zb_objset,
                            (u_longlong_t)zb->zb_object,
                            (u_longlong_t)zb->zb_level,
                            (u_longlong_t)zb->zb_blkid,
                            blkbuf);
                  }
            }
      }

      zcb->zcb_readfails = 0;

      if (dump_opt['b'] >= 4) {
            sprintf_blkptr(blkbuf, BP_SPRINTF_LEN, bp);
            (void) printf("objset %llu object %llu offset 0x%llx %s\n",
                (u_longlong_t)zb->zb_objset,
                (u_longlong_t)zb->zb_object,
                (u_longlong_t)blkid2offset(dnp, zb->zb_level, zb->zb_blkid),
                blkbuf);
      }

      return (0);
}

static int
dump_block_stats(spa_t *spa)
{
      zdb_cb_t zcb = { 0 };
      zdb_blkstats_t *zb, *tzb;
      uint64_t alloc, space, logalloc;
      vdev_t *rvd = spa->spa_root_vdev;
      int leaks = 0;
      int c, e;

      if (!dump_opt['S']) {
            (void) printf("\nTraversing all blocks %s%s%s%s%s...\n",
                (dump_opt['c'] || !dump_opt['L']) ? "to verify " : "",
                (dump_opt['c'] == 1) ? "metadata " : "",
                dump_opt['c'] ? "checksums " : "",
                (dump_opt['c'] && !dump_opt['L']) ? "and verify " : "",
                !dump_opt['L'] ? "nothing leaked " : "");
      }

      /*
       * Load all space maps as SM_ALLOC maps, then traverse the pool
       * claiming each block we discover.  If the pool is perfectly
       * consistent, the space maps will be empty when we're done.
       * Anything left over is a leak; any block we can't claim (because
       * it's not part of any space map) is a double allocation,
       * reference to a freed block, or an unclaimed log block.
       */
      if (!dump_opt['L'])
            zdb_leak_init(spa);

      /*
       * If there's a deferred-free bplist, process that first.
       */
      if (spa->spa_sync_bplist_obj != 0) {
            bplist_t *bpl = &spa->spa_sync_bplist;
            blkptr_t blk;
            uint64_t itor = 0;

            VERIFY(0 == bplist_open(bpl, spa->spa_meta_objset,
                spa->spa_sync_bplist_obj));

            while (bplist_iterate(bpl, &itor, &blk) == 0) {
                  if (dump_opt['b'] >= 4) {
                        char blkbuf[BP_SPRINTF_LEN];
                        sprintf_blkptr(blkbuf, BP_SPRINTF_LEN, &blk);
                        (void) printf("[%s] %s\n",
                            "deferred free", blkbuf);
                  }
                  zdb_count_block(spa, &zcb, &blk, DMU_OT_DEFERRED);
            }

            bplist_close(bpl);
      }

      zcb.zcb_haderrors |= traverse_pool(spa, zdb_blkptr_cb, &zcb);

      if (zcb.zcb_haderrors && !dump_opt['S']) {
            (void) printf("\nError counts:\n\n");
            (void) printf("\t%5s  %s\n", "errno", "count");
            for (e = 0; e < 256; e++) {
                  if (zcb.zcb_errors[e] != 0) {
                        (void) printf("\t%5d  %llu\n",
                            e, (u_longlong_t)zcb.zcb_errors[e]);
                  }
            }
      }

      /*
       * Report any leaked segments.
       */
      if (!dump_opt['L'])
            zdb_leak_fini(spa);

      /*
       * If we're interested in printing out the blkptr signatures,
       * return now as we don't print out anything else (including
       * errors and leaks).
       */
      if (dump_opt['S'])
            return (zcb.zcb_haderrors ? 3 : 0);

      alloc = spa_get_alloc(spa);
      space = spa_get_space(spa);

      /*
       * Log blocks allocated from a separate log device don't count
       * as part of the normal pool space; factor them in here.
       */
      logalloc = 0;

      for (c = 0; c < rvd->vdev_children; c++)
            if (rvd->vdev_child[c]->vdev_islog)
                  logalloc += rvd->vdev_child[c]->vdev_stat.vs_alloc;

      tzb = &zcb.zcb_type[ZB_TOTAL][DMU_OT_TOTAL];

      if (tzb->zb_asize == alloc + logalloc) {
            if (!dump_opt['L'])
                  (void) printf("\n\tNo leaks (block sum matches space"
                      " maps exactly)\n");
      } else {
            (void) printf("block traversal size %llu != alloc %llu "
                "(%s %lld)\n",
                (u_longlong_t)tzb->zb_asize,
                (u_longlong_t)(alloc + logalloc),
                (dump_opt['L']) ? "unreachable" : "leaked",
                (longlong_t)(alloc + logalloc - tzb->zb_asize));
            leaks = 1;
      }

      if (tzb->zb_count == 0)
            return (2);

      (void) printf("\n");
      (void) printf("\tbp count:      %10llu\n",
          (u_longlong_t)tzb->zb_count);
      (void) printf("\tbp logical:    %10llu\t avg: %6llu\n",
          (u_longlong_t)tzb->zb_lsize,
          (u_longlong_t)(tzb->zb_lsize / tzb->zb_count));
      (void) printf("\tbp physical:   %10llu\t avg:"
          " %6llu\tcompression: %6.2f\n",
          (u_longlong_t)tzb->zb_psize,
          (u_longlong_t)(tzb->zb_psize / tzb->zb_count),
          (double)tzb->zb_lsize / tzb->zb_psize);
      (void) printf("\tbp allocated:  %10llu\t avg:"
          " %6llu\tcompression: %6.2f\n",
          (u_longlong_t)tzb->zb_asize,
          (u_longlong_t)(tzb->zb_asize / tzb->zb_count),
          (double)tzb->zb_lsize / tzb->zb_asize);
      (void) printf("\tSPA allocated: %10llu\tused: %5.2f%%\n",
          (u_longlong_t)alloc, 100.0 * alloc / space);

      if (dump_opt['b'] >= 2) {
            int l, t, level;
            (void) printf("\nBlocks\tLSIZE\tPSIZE\tASIZE"
                "\t  avg\t comp\t%%Total\tType\n");

            for (t = 0; t <= DMU_OT_NUMTYPES; t++) {
                  char csize[6], lsize[6], psize[6], asize[6], avg[6];
                  char *typename;

                  typename = t == DMU_OT_DEFERRED ? "deferred free" :
                      t == DMU_OT_TOTAL ? "Total" : dmu_ot[t].ot_name;

                  if (zcb.zcb_type[ZB_TOTAL][t].zb_asize == 0) {
                        (void) printf("%6s\t%5s\t%5s\t%5s"
                            "\t%5s\t%5s\t%6s\t%s\n",
                            "-",
                            "-",
                            "-",
                            "-",
                            "-",
                            "-",
                            "-",
                            typename);
                        continue;
                  }

                  for (l = ZB_TOTAL - 1; l >= -1; l--) {
                        level = (l == -1 ? ZB_TOTAL : l);
                        zb = &zcb.zcb_type[level][t];

                        if (zb->zb_asize == 0)
                              continue;

                        if (dump_opt['b'] < 3 && level != ZB_TOTAL)
                              continue;

                        if (level == 0 && zb->zb_asize ==
                            zcb.zcb_type[ZB_TOTAL][t].zb_asize)
                              continue;

                        nicenum(zb->zb_count, csize);
                        nicenum(zb->zb_lsize, lsize);
                        nicenum(zb->zb_psize, psize);
                        nicenum(zb->zb_asize, asize);
                        nicenum(zb->zb_asize / zb->zb_count, avg);

                        (void) printf("%6s\t%5s\t%5s\t%5s\t%5s"
                            "\t%5.2f\t%6.2f\t",
                            csize, lsize, psize, asize, avg,
                            (double)zb->zb_lsize / zb->zb_psize,
                            100.0 * zb->zb_asize / tzb->zb_asize);

                        if (level == ZB_TOTAL)
                              (void) printf("%s\n", typename);
                        else
                              (void) printf("    L%d %s\n",
                                  level, typename);
                  }
            }
      }

      (void) printf("\n");

      if (leaks)
            return (2);

      if (zcb.zcb_haderrors)
            return (3);

      return (0);
}

static void
dump_zpool(spa_t *spa)
{
      dsl_pool_t *dp = spa_get_dsl(spa);
      int rc = 0;

      if (dump_opt['u'])
            dump_uberblock(&spa->spa_uberblock);

      if (dump_opt['d'] || dump_opt['i'] || dump_opt['m']) {
            dump_dir(dp->dp_meta_objset);
            if (dump_opt['d'] >= 3) {
                  dump_bplist(dp->dp_meta_objset,
                      spa->spa_sync_bplist_obj, "Deferred frees");
                  dump_dtl(spa->spa_root_vdev, 0);
            }

            if (dump_opt['d'] >= 3 || dump_opt['m'])
                  dump_metaslabs(spa);

            (void) dmu_objset_find(spa_name(spa), dump_one_dir, NULL,
                DS_FIND_SNAPSHOTS | DS_FIND_CHILDREN);
      }

      if (dump_opt['b'] || dump_opt['c'] || dump_opt['S'])
            rc = dump_block_stats(spa);

      if (dump_opt['s'])
            show_pool_stats(spa);

      if (rc != 0)
            exit(rc);
}

#define     ZDB_FLAG_CHECKSUM 0x0001
#define     ZDB_FLAG_DECOMPRESS     0x0002
#define     ZDB_FLAG_BSWAP          0x0004
#define     ZDB_FLAG_GBH            0x0008
#define     ZDB_FLAG_INDIRECT 0x0010
#define     ZDB_FLAG_PHYS           0x0020
#define     ZDB_FLAG_RAW            0x0040
#define     ZDB_FLAG_PRINT_BLKPTR   0x0080

int flagbits[256];

static void
zdb_print_blkptr(blkptr_t *bp, int flags)
{
      dva_t *dva = bp->blk_dva;
      int d;

      if (flags & ZDB_FLAG_BSWAP)
            byteswap_uint64_array((void *)bp, sizeof (blkptr_t));
      /*
       * Super-ick warning:  This code is also duplicated in
       * cmd/mdb/common/modules/zfs/zfs.c .  Yeah, I hate code
       * replication, too.
       */
      for (d = 0; d < BP_GET_NDVAS(bp); d++) {
            (void) printf("\tDVA[%d]: vdev_id %lld / %llx\n", d,
                (longlong_t)DVA_GET_VDEV(&dva[d]),
                (longlong_t)DVA_GET_OFFSET(&dva[d]));
            (void) printf("\tDVA[%d]:       GANG: %-5s  GRID:  %04llx\t"
                "ASIZE: %llx\n", d,
                DVA_GET_GANG(&dva[d]) ? "TRUE" : "FALSE",
                (longlong_t)DVA_GET_GRID(&dva[d]),
                (longlong_t)DVA_GET_ASIZE(&dva[d]));
            (void) printf("\tDVA[%d]: :%llu:%llx:%llx:%s%s%s%s\n", d,
                (u_longlong_t)DVA_GET_VDEV(&dva[d]),
                (longlong_t)DVA_GET_OFFSET(&dva[d]),
                (longlong_t)BP_GET_PSIZE(bp),
                BP_SHOULD_BYTESWAP(bp) ? "e" : "",
                !DVA_GET_GANG(&dva[d]) && BP_GET_LEVEL(bp) != 0 ?
                "d" : "",
                DVA_GET_GANG(&dva[d]) ? "g" : "",
                BP_GET_COMPRESS(bp) != 0 ? "d" : "");
      }
      (void) printf("\tLSIZE:  %-16llx\t\tPSIZE: %llx\n",
          (longlong_t)BP_GET_LSIZE(bp), (longlong_t)BP_GET_PSIZE(bp));
      (void) printf("\tENDIAN: %6s\t\t\t\t\tTYPE:  %s\n",
          BP_GET_BYTEORDER(bp) ? "LITTLE" : "BIG",
          dmu_ot[BP_GET_TYPE(bp)].ot_name);
      (void) printf("\tBIRTH:  %-16llx   LEVEL: %-2llu\tFILL:  %llx\n",
          (u_longlong_t)bp->blk_birth, (u_longlong_t)BP_GET_LEVEL(bp),
          (u_longlong_t)bp->blk_fill);
      (void) printf("\tCKFUNC: %-16s\t\tCOMP:  %s\n",
          zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name,
          zio_compress_table[BP_GET_COMPRESS(bp)].ci_name);
      (void) printf("\tCKSUM:  %llx:%llx:%llx:%llx\n",
          (u_longlong_t)bp->blk_cksum.zc_word[0],
          (u_longlong_t)bp->blk_cksum.zc_word[1],
          (u_longlong_t)bp->blk_cksum.zc_word[2],
          (u_longlong_t)bp->blk_cksum.zc_word[3]);
}

static void
zdb_dump_indirect(blkptr_t *bp, int nbps, int flags)
{
      int i;

      for (i = 0; i < nbps; i++)
            zdb_print_blkptr(&bp[i], flags);
}

static void
zdb_dump_gbh(void *buf, int flags)
{
      zdb_dump_indirect((blkptr_t *)buf, SPA_GBH_NBLKPTRS, flags);
}

static void
zdb_dump_block_raw(void *buf, uint64_t size, int flags)
{
      if (flags & ZDB_FLAG_BSWAP)
            byteswap_uint64_array(buf, size);
      (void) write(2, buf, size);
}

static void
zdb_dump_block(char *label, void *buf, uint64_t size, int flags)
{
      uint64_t *d = (uint64_t *)buf;
      int nwords = size / sizeof (uint64_t);
      int do_bswap = !!(flags & ZDB_FLAG_BSWAP);
      int i, j;
      char *hdr, *c;


      if (do_bswap)
            hdr = " 7 6 5 4 3 2 1 0   f e d c b a 9 8";
      else
            hdr = " 0 1 2 3 4 5 6 7   8 9 a b c d e f";

      (void) printf("\n%s\n%6s   %s  0123456789abcdef\n", label, "", hdr);

      for (i = 0; i < nwords; i += 2) {
            (void) printf("%06llx:  %016llx  %016llx  ",
                (u_longlong_t)(i * sizeof (uint64_t)),
                (u_longlong_t)(do_bswap ? BSWAP_64(d[i]) : d[i]),
                (u_longlong_t)(do_bswap ? BSWAP_64(d[i + 1]) : d[i + 1]));

            c = (char *)&d[i];
            for (j = 0; j < 2 * sizeof (uint64_t); j++)
                  (void) printf("%c", isprint(c[j]) ? c[j] : '.');
            (void) printf("\n");
      }
}

/*
 * There are two acceptable formats:
 *    leaf_name     - For example: c1t0d0 or /tmp/ztest.0a
 *    child[.child]*    - For example: 0.1.1
 *
 * The second form can be used to specify arbitrary vdevs anywhere
 * in the heirarchy.  For example, in a pool with a mirror of
 * RAID-Zs, you can specify either RAID-Z vdev with 0.0 or 0.1 .
 */
static vdev_t *
zdb_vdev_lookup(vdev_t *vdev, char *path)
{
      char *s, *p, *q;
      int i;

      if (vdev == NULL)
            return (NULL);

      /* First, assume the x.x.x.x format */
      i = (int)strtoul(path, &s, 10);
      if (s == path || (s && *s != '.' && *s != '\0'))
            goto name;
      if (i < 0 || i >= vdev->vdev_children)
            return (NULL);

      vdev = vdev->vdev_child[i];
      if (*s == '\0')
            return (vdev);
      return (zdb_vdev_lookup(vdev, s+1));

name:
      for (i = 0; i < vdev->vdev_children; i++) {
            vdev_t *vc = vdev->vdev_child[i];

            if (vc->vdev_path == NULL) {
                  vc = zdb_vdev_lookup(vc, path);
                  if (vc == NULL)
                        continue;
                  else
                        return (vc);
            }

            p = strrchr(vc->vdev_path, '/');
            p = p ? p + 1 : vc->vdev_path;
            q = &vc->vdev_path[strlen(vc->vdev_path) - 2];

            if (strcmp(vc->vdev_path, path) == 0)
                  return (vc);
            if (strcmp(p, path) == 0)
                  return (vc);
            if (strcmp(q, "s0") == 0 && strncmp(p, path, q - p) == 0)
                  return (vc);
      }

      return (NULL);
}

/*
 * Read a block from a pool and print it out.  The syntax of the
 * block descriptor is:
 *
 *    pool:vdev_specifier:offset:size[:flags]
 *
 *    pool           - The name of the pool you wish to read from
 *    vdev_specifier - Which vdev (see comment for zdb_vdev_lookup)
 *    offset         - offset, in hex, in bytes
 *    size           - Amount of data to read, in hex, in bytes
 *    flags          - A string of characters specifying options
 *           b: Decode a blkptr at given offset within block
 *          *c: Calculate and display checksums
 *          *d: Decompress data before dumping
 *           e: Byteswap data before dumping
 *          *g: Display data as a gang block header
 *          *i: Display as an indirect block
 *           p: Do I/O to physical offset
 *           r: Dump raw data to stdout
 *
 *              * = not yet implemented
 */
static void
zdb_read_block(char *thing, spa_t **spap)
{
      spa_t *spa = *spap;
      int flags = 0;
      uint64_t offset = 0, size = 0, blkptr_offset = 0;
      zio_t *zio;
      vdev_t *vd;
      void *buf;
      char *s, *p, *dup, *pool, *vdev, *flagstr;
      int i, error, zio_flags;

      dup = strdup(thing);
      s = strtok(dup, ":");
      pool = s ? s : "";
      s = strtok(NULL, ":");
      vdev = s ? s : "";
      s = strtok(NULL, ":");
      offset = strtoull(s ? s : "", NULL, 16);
      s = strtok(NULL, ":");
      size = strtoull(s ? s : "", NULL, 16);
      s = strtok(NULL, ":");
      flagstr = s ? s : "";

      s = NULL;
      if (size == 0)
            s = "size must not be zero";
      if (!IS_P2ALIGNED(size, DEV_BSIZE))
            s = "size must be a multiple of sector size";
      if (!IS_P2ALIGNED(offset, DEV_BSIZE))
            s = "offset must be a multiple of sector size";
      if (s) {
            (void) printf("Invalid block specifier: %s  - %s\n", thing, s);
            free(dup);
            return;
      }

      for (s = strtok(flagstr, ":"); s; s = strtok(NULL, ":")) {
            for (i = 0; flagstr[i]; i++) {
                  int bit = flagbits[(uchar_t)flagstr[i]];

                  if (bit == 0) {
                        (void) printf("***Invalid flag: %c\n",
                            flagstr[i]);
                        continue;
                  }
                  flags |= bit;

                  /* If it's not something with an argument, keep going */
                  if ((bit & (ZDB_FLAG_CHECKSUM | ZDB_FLAG_DECOMPRESS |
                      ZDB_FLAG_PRINT_BLKPTR)) == 0)
                        continue;

                  p = &flagstr[i + 1];
                  if (bit == ZDB_FLAG_PRINT_BLKPTR)
                        blkptr_offset = strtoull(p, &p, 16);
                  if (*p != ':' && *p != '\0') {
                        (void) printf("***Invalid flag arg: '%s'\n", s);
                        free(dup);
                        return;
                  }
            }
      }

      if (spa == NULL || strcmp(spa_name(spa), pool) != 0) {
            if (spa)
                  spa_close(spa, (void *)zdb_read_block);
            error = spa_open(pool, spap, (void *)zdb_read_block);
            if (error)
                  fatal("Failed to open pool '%s': %s",
                      pool, strerror(error));
            spa = *spap;
      }

      vd = zdb_vdev_lookup(spa->spa_root_vdev, vdev);
      if (vd == NULL) {
            (void) printf("***Invalid vdev: %s\n", vdev);
            free(dup);
            return;
      } else {
            if (vd->vdev_path)
                  (void) printf("Found vdev: %s\n", vd->vdev_path);
            else
                  (void) printf("Found vdev type: %s\n",
                      vd->vdev_ops->vdev_op_type);
      }

      buf = umem_alloc(size, UMEM_NOFAIL);

      zio_flags = ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_QUEUE |
          ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY;

      spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
      zio = zio_root(spa, NULL, NULL, 0);
      /* XXX todo - cons up a BP so RAID-Z will be happy */
      zio_nowait(zio_vdev_child_io(zio, NULL, vd, offset, buf, size,
          ZIO_TYPE_READ, ZIO_PRIORITY_SYNC_READ, zio_flags, NULL, NULL));
      error = zio_wait(zio);
      spa_config_exit(spa, SCL_STATE, FTAG);

      if (error) {
            (void) printf("Read of %s failed, error: %d\n", thing, error);
            goto out;
      }

      if (flags & ZDB_FLAG_PRINT_BLKPTR)
            zdb_print_blkptr((blkptr_t *)(void *)
                ((uintptr_t)buf + (uintptr_t)blkptr_offset), flags);
      else if (flags & ZDB_FLAG_RAW)
            zdb_dump_block_raw(buf, size, flags);
      else if (flags & ZDB_FLAG_INDIRECT)
            zdb_dump_indirect((blkptr_t *)buf, size / sizeof (blkptr_t),
                flags);
      else if (flags & ZDB_FLAG_GBH)
            zdb_dump_gbh(buf, flags);
      else
            zdb_dump_block(thing, buf, size, flags);

out:
      umem_free(buf, size);
      free(dup);
}

static boolean_t
nvlist_string_match(nvlist_t *config, char *name, char *tgt)
{
      char *s;

      if (nvlist_lookup_string(config, name, &s) != 0)
            return (B_FALSE);

      return (strcmp(s, tgt) == 0);
}

static boolean_t
nvlist_uint64_match(nvlist_t *config, char *name, uint64_t tgt)
{
      uint64_t val;

      if (nvlist_lookup_uint64(config, name, &val) != 0)
            return (B_FALSE);

      return (val == tgt);
}

static boolean_t
vdev_child_guid_match(nvlist_t *vdev, uint64_t guid)
{
      nvlist_t **child;
      uint_t c, children;

      verify(nvlist_lookup_nvlist_array(vdev, ZPOOL_CONFIG_CHILDREN,
          &child, &children) == 0);
      for (c = 0; c < children; ++c)
            if (nvlist_uint64_match(child[c], ZPOOL_CONFIG_GUID, guid))
                  return (B_TRUE);
      return (B_FALSE);
}

static boolean_t
vdev_child_string_match(nvlist_t *vdev, char *tgt)
{
      nvlist_t **child;
      uint_t c, children;

      verify(nvlist_lookup_nvlist_array(vdev, ZPOOL_CONFIG_CHILDREN,
          &child, &children) == 0);
      for (c = 0; c < children; ++c) {
            if (nvlist_string_match(child[c], ZPOOL_CONFIG_PATH, tgt) ||
                nvlist_string_match(child[c], ZPOOL_CONFIG_DEVID, tgt))
                  return (B_TRUE);
      }
      return (B_FALSE);
}

static boolean_t
vdev_guid_match(nvlist_t *config, uint64_t guid)
{
      nvlist_t *nvroot;

      verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
          &nvroot) == 0);

      return (nvlist_uint64_match(nvroot, ZPOOL_CONFIG_GUID, guid) ||
          vdev_child_guid_match(nvroot, guid));
}

static boolean_t
vdev_string_match(nvlist_t *config, char *tgt)
{
      nvlist_t *nvroot;

      verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
          &nvroot) == 0);

      return (vdev_child_string_match(nvroot, tgt));
}

static boolean_t
pool_match(nvlist_t *config, char *tgt)
{
      uint64_t guid = strtoull(tgt, NULL, 0);

      if (guid != 0) {
            return (
                nvlist_uint64_match(config, ZPOOL_CONFIG_POOL_GUID, guid) ||
                vdev_guid_match(config, guid));
      } else {
            return (
                nvlist_string_match(config, ZPOOL_CONFIG_POOL_NAME, tgt) ||
                vdev_string_match(config, tgt));
      }
}

static int
find_exported_zpool(char *pool_id, nvlist_t **configp, char *vdev_dir)
{
      nvlist_t *pools;
      int error = ENOENT;
      nvlist_t *match = NULL;

      if (vdev_dir != NULL)
            pools = zpool_find_import_activeok(g_zfs, 1, &vdev_dir);
      else
            pools = zpool_find_import_activeok(g_zfs, 0, NULL);

      if (pools != NULL) {
            nvpair_t *elem = NULL;

            while ((elem = nvlist_next_nvpair(pools, elem)) != NULL) {
                  verify(nvpair_value_nvlist(elem, configp) == 0);
                  if (pool_match(*configp, pool_id)) {
                        if (match != NULL) {
                              (void) fatal(
                                  "More than one matching pool - "
                                  "specify guid/devid/device path.");
                        } else {
                              match = *configp;
                              error = 0;
                        }
                  }
            }
      }

      *configp = error ? NULL : match;

      return (error);
}

int
main(int argc, char **argv)
{
      int i, c;
      struct rlimit rl = { 1024, 1024 };
      spa_t *spa;
      objset_t *os = NULL;
      char *endstr;
      int dump_all = 1;
      int verbose = 0;
      int error;
      int exported = 0;
      char *vdev_dir = NULL;

      (void) setrlimit(RLIMIT_NOFILE, &rl);
      (void) enable_extended_FILE_stdio(-1, -1);

      dprintf_setup(&argc, argv);

      while ((c = getopt(argc, argv, "udibcmsvCLS:U:lRep:t:")) != -1) {
            switch (c) {
            case 'u':
            case 'd':
            case 'i':
            case 'b':
            case 'c':
            case 'm':
            case 's':
            case 'C':
            case 'l':
            case 'R':
                  dump_opt[c]++;
                  dump_all = 0;
                  break;
            case 'L':
                  dump_opt[c]++;
                  break;
            case 'v':
                  verbose++;
                  break;
            case 'U':
                  spa_config_path = optarg;
                  break;
            case 'e':
                  exported = 1;
                  break;
            case 'p':
                  vdev_dir = optarg;
                  break;
            case 'S':
                  dump_opt[c]++;
                  dump_all = 0;
                  zdb_sig_user_data = (strncmp(optarg, "user:", 5) == 0);
                  if (!zdb_sig_user_data && strncmp(optarg, "all:", 4))
                        usage();
                  endstr = strchr(optarg, ':') + 1;
                  if (strcmp(endstr, "fletcher2") == 0)
                        zdb_sig_cksumalg = ZIO_CHECKSUM_FLETCHER_2;
                  else if (strcmp(endstr, "fletcher4") == 0)
                        zdb_sig_cksumalg = ZIO_CHECKSUM_FLETCHER_4;
                  else if (strcmp(endstr, "sha256") == 0)
                        zdb_sig_cksumalg = ZIO_CHECKSUM_SHA256;
                  else if (strcmp(endstr, "all") == 0)
                        zdb_sig_cksumalg = ZIO_CHECKSUM_FLETCHER_2;
                  else
                        usage();
                  break;
            case 't':
                  ub_max_txg = strtoull(optarg, NULL, 0);
                  if (ub_max_txg < TXG_INITIAL) {
                        (void) fprintf(stderr, "incorrect txg "
                            "specified: %s\n", optarg);
                        usage();
                  }
                  break;
            default:
                  usage();
                  break;
            }
      }

      if (vdev_dir != NULL && exported == 0) {
            (void) fprintf(stderr, "-p option requires use of -e\n");
            usage();
      }

      kernel_init(FREAD);
      g_zfs = libzfs_init();
      if (g_zfs == NULL)
            (void) fatal("error initializing libzfs\nPlease make sure zfs-fuse is running\n");

      for (c = 0; c < 256; c++) {
            if (dump_all && c != 'l' && c != 'R')
                  dump_opt[c] = 1;
            if (dump_opt[c])
                  dump_opt[c] += verbose;
      }

      argc -= optind;
      argv += optind;

      if (argc < 1) {
            if (dump_opt['C']) {
                  dump_cachefile(spa_config_path);
                  return (0);
            }
            usage();
      }

      if (dump_opt['l']) {
            dump_label(argv[0]);
            return (0);
      }

      if (dump_opt['R']) {
            flagbits['b'] = ZDB_FLAG_PRINT_BLKPTR;
            flagbits['c'] = ZDB_FLAG_CHECKSUM;
            flagbits['d'] = ZDB_FLAG_DECOMPRESS;
            flagbits['e'] = ZDB_FLAG_BSWAP;
            flagbits['g'] = ZDB_FLAG_GBH;
            flagbits['i'] = ZDB_FLAG_INDIRECT;
            flagbits['p'] = ZDB_FLAG_PHYS;
            flagbits['r'] = ZDB_FLAG_RAW;

            spa = NULL;
            while (argv[0]) {
                  zdb_read_block(argv[0], &spa);
                  argv++;
                  argc--;
            }
            if (spa)
                  spa_close(spa, (void *)zdb_read_block);
            return (0);
      }

      if (dump_opt['C'])
            dump_config(argv[0]);

      error = 0;
      if (exported) {
            /*
             * Check to see if the name refers to an exported zpool
             */
            char *slash;
            nvlist_t *exported_conf = NULL;

            if ((slash = strchr(argv[0], '/')) != NULL)
                  *slash = '\0';

            error = find_exported_zpool(argv[0], &exported_conf, vdev_dir);
            if (error == 0) {
                  nvlist_t *nvl = NULL;

                  if (vdev_dir != NULL) {
                        if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
                              error = ENOMEM;
                        else if (nvlist_add_string(nvl,
                            zpool_prop_to_name(ZPOOL_PROP_ALTROOT),
                            vdev_dir) != 0)
                              error = ENOMEM;
                  }

                  if (error == 0)
                        error = spa_import_verbatim(argv[0],
                            exported_conf, nvl);

                  nvlist_free(nvl);
            }

            if (slash != NULL)
                  *slash = '/';
      }

      if (error == 0) {
            if (strchr(argv[0], '/') != NULL) {
                  error = dmu_objset_open(argv[0], DMU_OST_ANY,
                      DS_MODE_USER | DS_MODE_READONLY, &os);
            } else {
                  error = spa_open(argv[0], &spa, FTAG);
            }
      }

      if (error)
            fatal("can't open %s: %s", argv[0], strerror(error));

      argv++;
      if (--argc > 0) {
            zopt_objects = argc;
            zopt_object = calloc(zopt_objects, sizeof (uint64_t));
            for (i = 0; i < zopt_objects; i++) {
                  errno = 0;
                  zopt_object[i] = strtoull(argv[i], NULL, 0);
                  if (zopt_object[i] == 0 && errno != 0)
                        fatal("bad object number %s: %s",
                            argv[i], strerror(errno));
            }
      }

      if (os != NULL) {
            dump_dir(os);
            dmu_objset_close(os);
      } else {
            dump_zpool(spa);
            spa_close(spa, FTAG);
      }

      fuid_table_destroy();

      libzfs_fini(g_zfs);
      kernel_fini();

      return (0);
}

Generated by  Doxygen 1.6.0   Back to index